Mitsubishi Electric FR-D720S SC EC Instruction Manual page 429

Parameter
Setting of the Pr. 555 "Current average time"
The average output current is calculated during Hi output of start bit (1s). Set the time taken to
average the current during start bit output in Pr. 555.
Setting of Pr. 557 "Current average value monitor signal output reference current"
Set the reference (100%) for outputting the signal of the current average value. Obtain the time
of the low pulse after a fixed start pulse of 1s from the following calculation.
Output current average value
---------------------------------------------------------------------------- -
Note that the output time range is 0.5 to 9s, and it is 0.5s when the output current average value
is less than 10% of the setting value of Pr. 557 and 9s when it exceeds 180%.
Example When Pr. 557 = 10A and the average value of output current is 15A, the current average
value monitor signal is output as low pulse shape for 7.5s.
Signal output time
Output of Pr. 503 "Maintenance timer"
After the output current average value is output as low pulse shape, the maintenance timer value
is output as high pulse shape. The output time of the maintenance timer value is obtained from
the following calculation.
Pr. 503
------------------------------------
40000h
Note that the output time range is 2 to 9s, and it is 2s when Pr. 503 is less than16000h and 9s
when it exceeds 72000h.
FR-D700 SC EC
×
Pr. 557
(s)
Output current average value
15A
×
= --------- - 5s
10A
×
100
×
5s (Maintenance timer value 100%/5s)
(s)
Maintenance timer value
5s (output current average value 100%/5s)
Fig. 6-144:
Signal output time for the current average
value
7.5s
Fig. 6-145:
Signal output time for the maintenance output
value
(h)
Useful functions
I001266E
I001267E
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